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CVE-2026-20039

Cisco Adaptive Security Appliance and Firepower Threat Defense Software SSL VPN Authentication Denial of Service Vulnerability PUBLISHED

Description (CNA)

A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to ineffective memory management of the VPN web server. An attacker could exploit this vulnerability by sending a large number of crafted HTTP requests to an affected device. A successful exploit could allow the attacker to cause the device to reload, resulting in a DoS condition.

Affected (CNA)

Vendor / productVersions
Cisco / Cisco Secure Firewall Adaptive Security Appliance (ASA) Softwareaffected 9.12.3; affected 9.12.1; affected 9.12.2; affected 9.12.4; affected 9.12.3.2; affected 9.12.3.7; affected 9.12.2.5; affected 9.12.3.12; affected 9.12.1.3; affected 9.12.2.4; affected 9.12.1.2; affected 9.12.2.9; affected 9.12.3.9; affected 9.12.2.1; affected 9.12.4.2; affected 9.12.4.4; affected 9.12.4.7; affected 9.12.4.8; affected 9.12.4.10; affected 9.12.4.13; affected 9.12.4.18; affected 9.12.4.24; affected 9.16.1; affected 9.12.4.26; affected 9.16.1.28; affected 9.12.4.29; affected 9.16.2; affected 9.12.4.30; affected 9.16.2.3; affected 9.12.4.35; affected 9.16.2.7; affected 9.12.4.37; affected 9.17.1; affected 9.16.2.11; affected 9.16.2.13; affected 9.12.4.39; affected 9.12.4.38; affected 9.16.2.14; affected 9.17.1.7; affected 9.12.4.40; affected 9.16.3.3; affected 9.16.3; affected 9.16.3.14; affected 9.17.1.9; affected 9.12.4.41; affected 9.17.1.10; affected 9.18.1; affected 9.12.4.47; affected 9.16.3.15; affected 9.18.1.3; affected 9.17.1.11; affected 9.12.4.48; affected 9.18.2; affected 9.16.3.19; affected 9.17.1.13; affected 9.12.4.50; affected 9.17.1.15; affected 9.12.4.52; affected 9.16.3.23; affected 9.18.2.5; affected 9.16.4; affected 9.12.4.54; affected 9.17.1.20; affected 9.18.2.7; affected 9.19.1; affected 9.16.4.9; affected 9.12.4.55; affected 9.18.2.8; affected 9.16.4.14; affected 9.18.3; affected 9.19.1.5; affected 9.12.4.56; affected 9.17.1.30; affected 9.19.1.9; affected 9.18.3.39; affected 9.16.4.19; affected 9.12.4.58; affected 9.19.1.12; affected 9.18.3.46; affected 9.16.4.27; affected 9.19.1.18; affected 9.18.3.53; affected 9.18.3.55; affected 9.16.4.38; affected 9.17.1.33; affected 9.12.4.62; affected 9.16.4.39; affected 9.18.3.56; affected 9.20.1; affected 9.16.4.42; affected 9.19.1.22; affected 9.18.4; affected 9.20.1.5; affected 9.18.4.5; affected 9.19.1.24; affected 9.16.4.48; affected 9.18.4.8; affected 9.20.2; affected 9.19.1.27; affected 9.12.4.65; affected 9.16.4.55; affected 9.18.4.22; affected 9.20.2.10; affected 9.16.4.57; affected 9.19.1.28; affected 9.17.1.39; affected 9.12.4.67; affected 9.18.4.24; affected 9.20.2.21; affected 9.16.4.61; affected 9.19.1.31; affected 9.18.4.29; affected 9.20.2.22; affected 9.16.4.62; affected 9.18.4.34; affected 9.20.3; affected 9.16.4.67; affected 9.16.4.70; affected 9.18.4.40; affected 9.23.1; affected 9.22.1.1; affected 9.16.4.71; affected 9.20.3.4; affected 9.18.4.47; affected 9.20.3.7; affected 9.17.1.45; affected 9.19.1.37; affected 9.17.1.46; affected 9.16.4.76; affected 9.20.3.9; affected 9.19.1.38; affected 9.18.4.50; affected 9.22.1.3; affected 9.20.3.10; affected 9.22.1.2; affected 9.18.4.52; affected 9.20.3.13; affected 9.22.1.6; affected 9.18.4.53; affected 9.16.4.82; affected 9.22.2; affected 9.19.1.42
Cisco / Cisco Secure Firewall Threat Defense (FTD) Softwareaffected 6.4.0.1; affected 6.4.0.2; affected 6.4.0.5; affected 6.4.0; affected 6.4.0.3; affected 6.4.0.4; affected 6.4.0.6; affected 6.4.0.7; affected 6.4.0.8; affected 6.4.0.9; affected 6.4.0.10; affected 6.4.0.11; affected 6.4.0.12; affected 7.0.0; affected 7.0.0.1; affected 7.0.1; affected 7.1.0; affected 6.4.0.13; affected 7.0.1.1; affected 6.4.0.14; affected 7.1.0.1; affected 7.0.2; affected 6.4.0.15; affected 7.2.0; affected 7.0.2.1; affected 7.0.3; affected 7.1.0.2; affected 7.2.0.1; affected 7.0.4; affected 7.2.1; affected 7.0.5; affected 6.4.0.16; affected 7.3.0; affected 7.2.2; affected 7.2.3; affected 7.3.1; affected 7.1.0.3; affected 7.2.4; affected 7.0.6; affected 7.2.5; affected 7.2.4.1; affected 7.3.1.1; affected 7.4.0; affected 6.4.0.17; affected 7.0.6.1; affected 7.2.5.1; affected 7.4.1; affected 7.2.6; affected 7.0.6.2; affected 7.4.1.1; affected 6.4.0.18; affected 7.2.7; affected 7.2.5.2; affected 7.3.1.2; affected 7.2.8; affected 7.6.0; affected 7.4.2; affected 7.2.8.1; affected 7.0.6.3; affected 7.4.2.1; affected 7.2.9; affected 7.0.7; affected 7.7.0; affected 7.4.2.2; affected 7.4.2.3; affected 7.0.8; affected 7.0.8.1; affected 7.4.2.4

CWE

CWE-244

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.